Performance Friction RH665 Racing Brake Fluid

The Performance Friction RH665 is a high‑end synthetic DOT 4 brake fluid engineered for race and track use, featuring a guaranteed minimum dry boiling point of 325 °C and wet boiling point of 195 °C. It delivers exceptional viscosity, lubricity and compressibility at extreme temperatures—ensuring a firm, consistent pedal feel under intense braking loads. Compatible with street and race systems and suitable for everything from track days to endurance events. 

Sold each in 500mL (1.057 US Pints) size.

Technical Details

• Guaranteed minimum Dry Boiling Point: 325 °C (617 °F)
• Guaranteed minimum Wet Boiling Point: 195 °C (383 °F)
• FMVSS 116 DOT 4 specification compliant—compatible with standard rubbers (SBR, EPDM) and metals
• Engineered for racing, track use, rally and high‑performance street/track cars
• Maintains low viscosity and firm ped­al feel even at extreme temperatures
• High lubricity and low compressibility ensure consistent braking performance and system longevity
• 100% synthetic formulation using glycol ether borate esters + polyalkylene glycol ethers
• Safe to mix with other DOT 4 fluids (though mixing will reduce optimal performance)
• Not suitable for magnesium components or mineral oil‑based brake systems
• Available in 500 mL bottles (Part No. 025.0037) and 12‑pack case (Part No. 025.0038)

Specifications:

• Type: Synthetic
• Specification: FMVSS 116 DOT 4
• ERBP Dry Boiling Point: 615°F (325°C) (see note below)
• ERBP Wet Boiling Point: 383°F (195°C) (see note below)
• Viscosity at 100°C: 2.6 cSt
• Viscosity at - 40°C: 1475 cSt
• pH: 7.12
• Density at 20°C: 1.073
• Compressibility at 100°C: 1.01 x 10 -3 MPa-1

• Guaranteed minimum Dry Boiling Point: 325 °C (617 °F)
• Guaranteed minimum Wet Boiling Point: 195 °C (383 °F)
• FMVSS 116 DOT 4 specification compliant—compatible with standard rubbers (SBR, EPDM) and metals
• Engineered for racing, track use, rally and high‑performance street/track cars
• Maintains low viscosity and firm ped­al feel even at extreme temperatures
• High lubricity and low compressibility ensure consistent braking performance and system longevity
• 100% synthetic formulation using glycol ether borate esters + polyalkylene glycol ethers
• Safe to mix with other DOT 4 fluids (though mixing will reduce optimal performance)
• Not suitable for magnesium components or mineral oil‑based brake systems
• Available in 500 mL bottles (Part No. 025.0037) and 12‑pack case (Part No. 025.0038)

Specifications:

• Type: Synthetic
• Specification: FMVSS 116 DOT 4
• ERBP Dry Boiling Point: 615°F (325°C) (see note below)
• ERBP Wet Boiling Point: 383°F (195°C) (see note below)
• Viscosity at 100°C: 2.6 cSt
• Viscosity at - 40°C: 1475 cSt
• pH: 7.12
• Density at 20°C: 1.073
• Compressibility at 100°C: 1.01 x 10 -3 MPa-1